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V A Davydov

Publications and source records attributed to V A Davydov.

11 recordsLinked to original sources
PubMed2002

Excitation fronts in a spatially modulated light-sensitive Belousov-Zhabotinsky system.

The evolution of excitation wave fronts in a spatially modulated light-sensitive Belousov-Zhabotinsky system is investigated experimentally and theoretically. The excitation wave propagates in a thin, quasi-two-dimensional reaction layer, which is illuminated through a periodical gray level mask. The light-induced differences in excitability and velocity give rise to a temporal and spatial modulation of the initially flat fronts. The experimental front evolution is described in the framework of a kinematical theory as developed earlier for nonuniformly curved systems.

Journal Article↗
PubMed2001

Magnetic carbon.

The discovery of nanostructured forms of molecular carbon has led to renewed interest in the varied properties of this element. Both graphite and C60 can be electron-doped by alkali metals to become superconducting; transition temperatures of up to 52 K have been attained by field-induced hole-doping of C60 (ref. 2). Recent experiments and theoretical studies have suggested that electronic instabilities in pure graphite may give rise to superconducting and ferromagnetic properties, even at room temperature. Here we report the serendipitous discovery of strong magnetic signals in rhombohedral C60. Our intention was to search for superconductivity in polymerized C60; however, it appears that our high-pressure, high-temperature polymerization process results in a magnetically ordered state. The material exhibits features typical of ferromagnets: saturation magnetization, large hysteresis and attachment to a magnet at room temperature. The temperature dependences of the saturation and remanent magnetization indicate a Curie temperature near 500 K.

Journal Article↗
PubMed1999

[The characteristics of operator activity in a sensorially enriched environment].

The mechanism of Ukhtomskiĭ's dominant was used to improve operator's performance activity. Recognition of visual images--obscured Arabic numerals--in a sensorially rich environment (classic or rock music records) turned to be more successful: time of the task was reduced and the probability of correct identification increased. A reverse U-shaped dependence between the intensity of music and identification was stated. Repetition of music fragments at a constant value marred the positive effect.

Environment, Controlled↗
PubMed1980

[Lincomycin concentration in the blood and tissues when administered by electrophoresis in children with acute and chronic hematogenic osteomyelitis].

Twenty five children suffering from acute and chronic hematogenic osteomyelitis were subjected to lincomycin therapy in addition to surgical and general tonic treatment. The antibiotic was administered by means of electrophoresis in 15 children and by means of electrophoresis together with intramuscular injections in 10 children. It was found that administration of the drug by means of electrophoresis 1 hour after its intramuscular injection provided the highest lincomycin levels in the bone cavity favourable for the disease treatment.

Adolescent↗
PubMedDate not supplied

[Electroureterograph and dynamoureterograph].

The results of investigations made by the authors showed that the signal spectra of the bioelectrical and mechanical activity of the ureteral smooth muscles lie within the range of 0.05--1 Hz. The developed devices for registration of electro-and dynamograms of ureters may be utilized in investigating the functional state of the urinary system of the organism.

Action Potentials↗